Questions about condom......?

On the inside of the box of condoms they tell you what to do if the condom breaks. I've used hundreds of trojans and never had one break on me. But, I'm just one person so you can't generalize to all of their condoms from my experience. Thinner condoms are more likely to break. I don't know why, but it says in the directions to NEVER wear more than one condom at a time. There must be a good reason for this, otherwise the company would tell you to wear two at a time so that you would use them up faster and they could make more money. If you use a condom and she takes the pill your chances of an unwanted pregnancy are practically zero, uming you both do it correctly of course.